gear box for extruder machine 1.Highly Standard Modular Designed 2.High Strength,Compact Dimension 3.Long Service Life PV series general helical ... China, have specialized in the field of injection and extruder machine parts.Features of products 1. Highly Standard Modular DesignedThe ... Pictures of Screw Barrel : Series double screw gear box for extruder machine(PVC, PP, PE, PA, PC, ABS .etc)